Grades 5-6 Video Solutions 2022-2022_5-6

Video Transcription

Question number 4. Cistercian numerals were used in the early 13th century. Any integer from 1 to 99 can be represented by a single glyph by combining two of the glyphs shown below.  Take a look at the glyphs over here. The glyph for 24 looks like this. The glyph for 81 looks like this. And the glyph for 93 looks like this. What does the glyph for 45 look like?  So, based on the example glyphs, numbers that are not one digit or multiples of 10 are combined versions of the 10s value glyph and the 1s value glyph.  And we can see that over here. For example, in 24, we see the 20 on the left side and then the 4 on the right side.  Similarly, for the 81, we have the shape over here for the 80 and the extra line over here for the 81.  And for 90, we have this square on top on the left-hand side and then this downward line for the 3.  So the glyph for 45 would then be the combination of the glyph for 40 and the glyph for 5.  That is shown in answer D, which combines this up arrow on the left side for 40 as well as this triangle on the right side for 5.

Video Summary

The Cistercian numeral system uses glyphs to represent numbers. For values between 1 and 99, two glyphs are combined: the tens value glyph and the ones value glyph. For example, the glyph for 24 combines the glyph for 20 and the glyph for 4. Similarly, for 81, the glyph includes the glyph for 80 with an additional line for 1. The glyph for the number 45 is created by combining the glyph for 40 (an up arrow on the left) and the glyph for 5 (a triangle on the right). This combination is shown in option D.